Scott, The entire North East corner of Seneca lake is a park....Seneca Lake State Park.
There are docks to fish from but only in the back waters fed by the Seneca River.
The Marina at Sampson State park is on the East side about 15 miles down the lake. There is a break wall to open water and marina.
Both parks can be fished till the resident boats start moving in for the summer.
RG